Divide:
x + 2x2 + 3x4 - x5 by 2x
y4 - 3y3 + (1/2)y2 by 3y
- 4a3 + 4a2 + a by 2a
-x6 + 2x4 + 4x3 + 2x2 by 2– √x2
5z3 - 6z2 + 7z by 2z